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Update stub dispatch hidden argument convention for CoreRT #14120

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Sep 21, 2017
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Update stub dispatch hidden argument convention for CoreRT #14120

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Update stub dispatch hidden argument convention for CoreRT
jkotas Sep 21, 2017
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jkotas Sep 21, 2017
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2 changes: 1 addition & 1 deletion Documentation/botr/clr-abi.md
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Expand Up @@ -75,7 +75,7 @@ NOTE: This optimization is now disabled for all platforms (`IsStructRequiringSta

## Hidden parameters

*Stub dispatch* - when a virtual call uses a VSD stub, rather than back-patching the calling code (or disassembling it), the JIT must place the address of the stub used to load the call target, the "stub indirection cell", in (x86) `EAX` / (AMD64) `R11` / (ARM) `R4` / (ARM64) `R11`. In the JIT, this is `REG_VIRTUAL_STUB_PARAM`.
*Stub dispatch* - when a virtual call uses a VSD stub, rather than back-patching the calling code (or disassembling it), the JIT must place the address of the stub used to load the call target, the "stub indirection cell", in (x86) `EAX` / (AMD64) `R11` / (AMD64 CoreRT ABI) `R10` / (ARM) `R4` / (ARM CoreRT ABI) `R12` / (ARM64) `R11`. In the JIT, this is encapsulated in the `VirtualStubParamInfo` class.

AMD64-only: Fast Pinvoke - The VM wants a conservative estimate of the size of the stack arguments placed in `R11`. (This is consumed by callout stubs used in SQL hosting).

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